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Stock And Stock-Based Incentive Plans (Composition Of Share-Based Compensation Expense - By Grant Type) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2014
Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense, before income taxes $ 22,701 $ 15,379 $ 38,420 $ 38,608
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense, before income taxes 6,887 5,786 15,007 12,819
Cash-Settled Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense, before income taxes 11,074 5,884 14,221 17,972
Stock-Settled Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense, before income taxes 3,472 2,891 7,593 6,711
Employee Stock Purchase Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense, before income taxes 311 318 642 606
Restricted Stock Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense, before income taxes 957 0 957 0
Stock Grants To Non-Employee Directors [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense, before income taxes $ 0 $ 500 $ 0 $ 500